Journal List > Korean J Orthod > v.38(1) > 1043570

Korean J Orthod. 2008 Feb;38(1):41-51. Korean.
Published online February 29, 2008.  https://doi.org/10.4041/kjod.2008.38.1.41
Copyright © 2008 Korean Association of Orthodontists
A comparative study of initial lateral cephalometric characteristics: mandibular setback surgery only versus mandibular setback surgery with advancement genioplasty
Jae-Sik Kim, DMD, MSD,a Jung-Il Kim, DDS, MSD, PhD,b and Seung-Goo Kang, DMD, MSD, PhDc
aGraduate Student, Department of Orthodontics, School of Dentistry, Kyunghee University, Korea.
bKooalldam Dental Hospital, Korea.
cAssistant Professor, Department of Orthodontics, School of Dentistry, Kyunghee University, Korea.

Corresponding author: Seung-Goo Kang. Department of Orthodontics, Kyunghee University, 1 Hoegi-Dong, Dongdaemun-Gu, Seoul 130-702, Korea. +82 2 958 9395; Email: orthodrk@khu.ac.kr.
Received June 20, 2007; Revised January 19, 2008; Accepted January 21, 2008.

Abstract

Objective

The aim of this study was to compare the initial lateral cephalometric characteristics in two groups of patients: those that had mandibular setback surgery only and those that had mandibular setback surgery with advancement genioplasty.

Methods

The lateral cephalograms of thirty-one patients were studied. Twenty-one Class III patients (group A) had only madibular setback surgery. Twelve Class III patients (group B) had mandibular setback surgery with advancement genioplasty.

Results

Differences between two groups were found in N-Me, ANS-Me, Occlusal Plane angle, Palatal Plane to U1, Mandibular Plane to L1, Mandibular Plane to L6, SN to U1, Sn-Stms, and Pog' projection. Compared to group A, group B showed more linguoversion and extrusion of upper incisors, more extrusion of lower incisors and lower first molar, and more steepness of the occlusal plane. N-Me, ANS-Me, and Sn-Stms were also longer in group B. But Pog' projection was shorter than group A.

Conclusion

We conclude that certain initial lateral cephalometric characteristics may help indicate the inclusion of advancement genioplasty when mandibular setback surgery is planned in skeletal Class III patients.

Keywords: Orthognathic surgery; Advancement genioplasty; Class III malocclusion

Figures


Fig 1
Skeletal measurements. A, Angular; B, linear. 1, Gonial angle (°); 2, ramus height (mm); 3, body length (mm); 4, body to anterior cranial base: body length/S-Na; 5, SNA (°); 6, SNB (°); 7, ANB (°); 8, ODI, AB to Mn.plane ± palatal plane; 9, APDI, facial angle ± AB plane ± palatal plane; 10, CF, ODI+APDI; 11, FMA (°); 12, facial height ratio, posterior facial height/anterior facial height; 13, posterior facial height ratio, ramus height/S-Go; 14, anterior facial height ratio, ANS-Me/Na-Me; 15, N-Me (mm); 16, ANS-Me (mm).
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Fig 2
Dental measurements. A, Angular; B, linear. 1, Overjet (mm); 2, overbite (mm); 3, posterior occlusal plane angle (°); 4, FH to occlusal plane (°); 5, occlusal plane to GoMe (°); 6, Mx. OP to AB (°); 7, FH to Mx.OP (°); 8, FH to Mn.OP (°); 9, palatal plane to upper 1 (mm); 10, palatal plane to upper 6 (mm); 11, 10/9; 12, upper 1 to NA (°); 13, upper 1 to NA (mm); 14, upper 1 to FH (°); 15, lower 1 to NB (°); 16, lower 1 to NB (mm); 17, lower 1 to Mn. plane (°); 18, Mn. plane to Lower 1 (mm); 19, Mn. plane to Lower 6 (mm); 20, 19/18.
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Fig 3
Soft tissue measurements. 1, Upper lip to E-line (mm); 2, lower lip to E-line (mm); 3, Sn-Stms (mm): distance between Sn and Stms perpendicular to FH; 4, nose tip projection (mm), distance of nose tip from Sn-perpendicular line; 5, A' projection (mm), distance of A' from Sn-perpendicular line; 6, B' projection (mm), distance of B' from Sn-perpendicular line; 7, upper lip projection (mm), distance of upper lip from Sn-perpendicular line; 8, lower Lip projection (mm), distance of lower lip from Sn-perpendicular line; 9, Pog' projection (mm), distance of Pog' from Sn-perpendicular line; 10, mento-labial angle (°); 11, nasolabial angle (°); 12, Pog' thickness (mm), distance between Pog and Pog' parallel to FH. (Sn-perpendicular line=a line tangent to Sn perpendicular to FH)
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Fig 4
Chin measurements. A,1, C-curve, angle between Id-B and B-Pog; 2, chin concave depth, distance of B from Id-Pog; 3, C-angle, angle between Go-Me and Id-Pog; 4, M-angle, angle between Go-Me and B-Pog; 5, S-angle, angle between Go-Me and B-Me; 6, chin height, distance between Me and B; 7, chin depth, distance of Pog from Me-B; 8, chin ratio, chin depth/chin height × 100 (%); B,9, Pog to NB, distance of Pog from Na-B; 10, Pog to upper occlusal plane, distance of Pog from line tangent to B perpendicular to MxOP; 11, Pog to Mn. Plane, distance of Pog from line tangent to B perpendicular to Go-Me; 12, Pog. to FH, distance of Pog from line tangent to B perpendicular to FH.
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Tables


Table 1
Means and standard deviations of soft tissue measurements at post treatment
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Table 2
Means and standard deviations of skeletal measurements
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Table 3
Means and standard deviations of dental measurements
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Table 4
Means and standard deviations of soft tissue measurements
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Table 5
Means and standard deviations of chin measurements
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Table 6
Pearson Correlations of soft tissue Pog projection
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Table 7
Pearson Correlations of Sn-Stms
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Table 8
Means and standard deviations of nasolabial angle
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